An Inconvenient Truth Al Gore's documentary, directed by Davis Guggenheim, is now available on DVD. The book version of An Inconvenient Truth is also available now. www.climatecrisis.net.

An Inconvenient Truth House Party Help Al Gore spread the word about global warming. www.algore.com

Everything's Cool This documentary is an official selection of the 2007 Sundance Film Festival. www.everythingscool.org

Tree Hugger Tree Hugger is a Web magazine with tips and advice on living a sustainable lifestyle, and seeking environmental solutions and initiatives. www.treehugger.com

Earth 911 Earth 911 seeks to empower the public with community-specific resources to improve their quality of life. Find information about recycling your Christmas tree, too. www.earth911.com

Sierra Club Sierra Club is the largest and oldest non-profit environmental organization working to protect the planet. www.sierraclub.org

Stop Global Warming Virtual March The Stop Global Warming Virtual March is a non-political effort bringing Americans together to declare that global warming is here now and it's time to act. www.stopglobalwarming.org

Competitive Enterprise Institute Marlo Lewis Jr., a skeptic about global warming, represented this organization. The CEI, dedicated to advancing the principles of free enterprise and limited government, is recognized as a leading voice on a broad range of regulatory issues. www.cei.org